It's Elemental - Isotopes of the Element Argon

Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Argon with a Known Natural Abundance

All Known Isotopes of the Element Argon

Mass Number	Half-life	Decay Mode	Branching Percentage

30	< 20 nanoseconds	Proton Emission	No Data Available

31	15.1 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	69.00

		Electron Capture	7.60

32	98 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	43.00

33	173.0 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	38.70

34	844.5 milliseconds	Electron Capture	100.00

35	1.775 seconds	Electron Capture	100.00

36	Stable	-	-

37	35.04 days	Electron Capture	100.00

38	Stable	-	-

39	269 years	Beta-minus Decay	100.00

40	Stable	-	-

41	109.61 minutes	Beta-minus Decay	100.00

42	32.9 years	Beta-minus Decay	100.00

43	5.37 minutes	Beta-minus Decay	100.00

44	11.87 minutes	Beta-minus Decay	100.00

45	21.48 seconds	Beta-minus Decay	100.00

46	8.4 seconds	Beta-minus Decay	100.00

47	≈ 700 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	< 1.00

48	No Data Available	Beta-minus Decay	No Data Available

49	≥ 170 nanoseconds	Beta-minus Decay	No Data Available

50	≥ 170 nanoseconds	Beta-minus Decay	No Data Available

51	> 200 nanoseconds	Beta-minus Decay	No Data Available

52	10 milliseconds	Beta-minus Decay	No Data Available

53	3 milliseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available